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<table width="100%" summary="page for stagec"><tr><td>stagec</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Stage C Prostate Cancer</h2>

<h3>Description</h3>

<p>A set of 146 patients with stage C prostate cancer, from a
study exploring the prognostic value of flow cytometry.</p>


<h3>Usage</h3>

<pre>data(stagec)</pre>


<h3>Format</h3>

<p>A data frame with 146 observations on the following 8 variables.
</p>

<dl>
<dt><code>pgtime</code></dt><dd><p>Time to progression or last follow-up (years)</p>
</dd>
<dt><code>pgstat</code></dt><dd><p>1 = progression observed, 0 = censored</p>
</dd>
<dt><code>age</code></dt><dd><p>age in years</p>
</dd>
<dt><code>eet</code></dt><dd><p>early endocrine therapy, 1 = no, 2 = yes</p>
</dd>
<dt><code>g2</code></dt><dd><p>percent of cells in G2 phase, as found by flow cytometry</p>
</dd>
<dt><code>grade</code></dt><dd><p>grade of the tumor, Farrow system</p>
</dd>
<dt><code>gleason</code></dt><dd><p>grade of the tumor, Gleason system</p>
</dd>
<dt><code>ploidy</code></dt><dd><p>the ploidy status of the tumor, from flow
cytometry. Values are <span class="samp">diploid</span>, <span class="samp">tetraploid</span>,
and <span class="samp">aneuploid</span></p>
</dd>
</dl>



<h3>Details</h3>

<p>A tumor is called diploid (normal complement of dividing cells) if the
fraction of cells in G2 phase was determined to be 13% or less.
Aneuploid cells have a measurable fraction with a chromosome count that
is neither 24 nor 48, for these the G2 percent is difficult or
impossible to measure.
</p>


<h3>Examples</h3>

<pre>
require(survival)
rpart(Surv(pgtime, pgstat) ~ ., stagec)
</pre>


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